Polyhydroxyalkanoate synthase and gene encoding the same enzyme

ABSTRACT

A novel polyhydroxyalkanoate (PHA) synthase derived from a microorganism capable of producing a PHA having a novel side-chain structure and a DNA encoding the amino acid sequence for the synthase are provided. Two PHA synthase proteins (SEQ ID NOs. 1 and 3) derived from Pseudomonas cichorii H45 (FERM BP-7374) and PHA synthase genes encoding these PHA synthases are provided, respectively (SEQ ID NOs. 2 and 4). A recombinant microorganism is endowed with a PHA producing ability.

This is a continuation-in-part application of U.S. patent application Ser. No. 09/820,952 filed on Mar. 30, 2001, now abandoned.

BACKGROUND OF THE INVENTION

1. Field of the Invention

This invention relates to a polyhydroxyalkanoate (hereinafter, referred to as a “PHA”) synthase, a gene encoding the PHA synthase, a recombinant vector containing the gene, a transformant capable of expressing the PHA synthase which has been transformed by the recombinant vector, a process for producing the PHA synthase utilizing the transformant, and a process for preparing the PHA utilizing the transformant. In particular, this invention relates to a microorganism-derived PHA synthase capable of producing a polyhydroxyalkanoate and a gene encoding the PHA synthase utilized for expressing the PHA synthase by transformation.

2. Related Background Art

There have been reported a number of microorganisms producing poly-3-hydroxybutyric acid (PHB) or another PHA and storing it therein (“Biodegradable Plastic Handbook”, edited by Biodegradative Plastic Research Society, NTS Co. Ltd., p.178-197). These polymers may be, as conventional plastics, used for producing a variety of products by, for example, melt-processing. Since they are biodegradable, they have an advantage that they can be completely degraded by microorganisms in the natural environment, and they do not cause pollution due to remaining in the natural environment like many conventional polymer compounds. Furthermore, they are excellently biocompatible, and thus are expected to be used in applications such as a medical soft member.

It is known that a composition and a structure of such a PHA produced by a microorganism may considerably vary depending on the type of a microorganism used for the production, a culture-medium composition and culturing conditions. Investigations have been, therefore, mainly focused on controlling such a composition or structure for the purpose of improving physical properties of a PHA.

For example, Japanese Patent Application Laid-Open Nos. 6-15604, 7-14352 and 8-19227 describe that Alcaligenes eutropus H16 (ATCC No. 17699) and its variants may produce 3-hydroxybutyric acid (3HB) and its copolymer with 3-hydroxyvaleric acid (3HV) with various composition ratios by changing a carbon source during culturing.

Japanese Patent Publication No. 2642937 discloses that PHA in which a monomer unit is 3-hydroxyalkanoate with 6 to 12 carbon atoms may be produced by supplying a non-cyclic aliphatic hydrocarbon as a carbon source to Pseudomonas oleovorans (ATCC No. 29347).

Japanese Patent Application Laid-Open No. 5-74492 discloses methods in which Methylobaterium sp., Paracoccus sp., Alcaligenes sp., and Pseudomonas sp. are contacted with a primary alcohol with 3 to 7 carbon atoms to produce a copolymer of 3HB and 3HV.

Japanese Patent Application Laid-Open Nos. 5-93049 and 7-265065 disclose that Aeromonas caviae is cultured using oleic acid or olive oil as a carbon source to produce a two-component copolymer of 3HB and 3-hydroxyhexanoic acid (3HHx).

Japanese Patent Application Laid-Open No. 9-191893 discloses that Comamonas acidovorans IF013852 is cultured using gluconic acid and 1,4-butanediol as carbon sources to produce a polyester having 3HB and 4-hydroxybutyric acid as monomer units.

Furthermore, it is reported that certain microorganisms produce PHAs having a variety of substituents such as unsaturated hydrocarbon, ester, aryl (aromatic), and cyans groups, halogenated hydrocarbon and epoxide. Recently, there have been attempts for improving physical properties of a PHA produced by a microorganism using such a procedure. For example, Makromol. Chem., 191, 1957-1965 (1990); Macromolecules, 24, 5256-5260 (1991); and Chirality, 3, 492-494 (1991) describe production of a PHA comprising 3-hydroxy-5-phenylvaleric acid (3HPV) as a monomer unit by Pseudomonas oleovorans, where variations in polymer physical properties probably due to the presence of 3HPV were observed.

As described above, microorganism-produced PHAs with various combinations of composition and structure have been obtained by varying factors such as the type of a microorganism used, a culture medium composition and culturing conditions. Each microorganism has an intrinsic PHA synthase with a substrate specificity which is significantly different from others. Thus, it has been difficult to produce PHAs comprising different monomer units suitable to a variety of applications using known microorganisms or PHA synthases in such known microorganisms.

Meanwhile, as described above, a PHA having a variety of substituents in its side chains may be expected to be a “functional polymer” having significantly useful functions and properties owing to the properties of the introduced substituents. It is, therefore, extremely useful and important to search and develop a microorganism which can produce and store a very useful polymer having both such functionality and biodegradability. Furthermore, identification of a PHA synthase involved in production of the highly useful PHA and obtaining a gene encoding the PHA synthase may allow us to produce a novel transformed microorganism capable of producing a desired PHA. That is, constructing a recombinant vector comprising a gene encoding a PHA synthase and providing a microorganism transformed by the recombinant vector may allow us to prepare a PHA using the transformed microorganism or to express a recombinant type of PHA synthase. As described above, it may be important that a transformed microorganism is used to prepare a desired PHA for providing a highly useful tool for improving a productivity for the PHA and for promoting utilization of the PHA.

SUMMARY OF THE INVENTION

Objects of this invention which can solve the above problems are to search a novel microorganism capable of producing and storing in microorganisms a PHA having a novel side-chain structure, to identify an enzyme protein related to the ability of producing the novel PHA, i.e., a novel PHA synthase, and to determine a gene encoding its amino acid sequence. More specifically, an object of the present invention is to provide a novel PHA synthase derived from a microorganism producing a PHA having a novel side chain structure and a DNA encoding its amino acid sequence. Another object of this invention is to provide a recombinant vector to which a DNA encoding an available PHA synthase is introduced and which is used for transformation of a microorganism and a transformed microorganism produced using the recombinant vector. A further object of this invention is to provide a process for expressing and producing a recombinant PHA synthase in the transformed microorganism and a process for preparing a desired PHA using the transformed microorganism.

Still another object of this invention is to provide a modified PHA synthase in which its amino acid sequence is modified as long as an enzyme activity is not affected in expression of the recombinant PHA synthase in the transformed microorganism as described above and a DNA encoding the modified amino acid sequence.

For developing a PHA having a novel side-chain structure useful as, for example, a device material or a medical material aiming at solving the above problems, the inventors have searched a novel microorganism capable of producing and storing the desired PHA therein. Additionally, the inventors have intensely investigated selected novel microorganisms producing a novel PHA for identifying a PHA synthase involved in production of the novel PHA and for obtaining a gene encoding the PHA synthase. Furthermore, the inventors have conducted investigation for constructing a recombinant vector with a gene for the obtained PHA synthase, transforming a host microorganism using the recombinant vector, expressing a recombinant PHA synthase in the transformed microorganism obtained and determining production of the desired PHA.

In the course of the above investigation, the inventors synthesized 5-(4-fluorophenyl) valeric acid (FPVA) represented by formula (II):

and separated from a soil a novel microorganism capable of converting the above compound (II) as a starting material (substrate) into corresponding 3-hydroxy-5-(4-fluorophenyl)valeric acid (3HFPV) represented by formula (III):

and producing and storing a novel PHA with a monomer unit represented by formula (I):

derived from 3HFPV. The novel microorganism separated is designated as H45 strain. The inventors have also found that in addition to the above enzymatic activity for converting FPVA into 3HFPV, the H45 strain may also use 4-cyclohexylbutyric acid (CHxBA) represented by formula (IV):

as a starting material (substrate) to convert it into 3-hydroxy-4-cyclohexylbutyric acid (3HCHxB) represented by formula (V):

and to produce and store a PHA with a monomer unit represented by formula (VI):

derived from 3HCHxB.

Microbiological properties of H45 strain are as follows.

<Microbiological properties of H45 strain>

Morphologic Properties

Cell shape and size: Bacilliform, 0.8 μm×1.0 to 1.2 μm

Cell polymorphism: No

Motility: Yes

Sporulation: No

Gram stainability: Negative

Colonization: Circular, smooth in the overall periphery, low convex, smooth surface, gloss, yellowish white

Physiological Properties

Catalase: Positive

Oxidase: Positive

O/F test: oxidized form

Reduction of a nitrate: Negative

Indole formation: Negative

Acidification of dextrose: Negative

Arginine dihydrolase: Negative

Urease: Negative

Esculin hydrolysis: Negative

Gelatin hydrolysis: Negative

β-Galactosidase: Negative

Fluorochrome production on King's B agar: Positive

Formation with 4% Nacl: Negative

Accumulation of poly-β-hydroxybutyric acid: Negative

Substrate Assimilation Ability

Dextrose: Positive

L-Arabinose: Negative

D-Mannose: Positive

D-Mannitol: Positive

N-Acetyl-D-glucosamine: Positive

Maltose: Negative

Potassium gluconate: Positive

n-Capric acid: Positive

Adipic acid: Negative

dl-Malic acid: Positive

Sodium citrate: Positive

Phenyl acetate: Positive

From these microbiological properties, the inventors have attempted to categorize H45 strain according to Bergey's Manual of Systematic Bacteriology, Volume 1 (1984) and Bergey's Manual of Determinative Bacteriology 9th ed. (1994) to determine that the strain belongs to Pseudomonas cichorii. Thus, it was designated as Pseudomonas cichorii H45. There have been no reports on a strain in Pseudomonas cichorii capable of producing a PHA as exhibited by H45 strain. The inventors have, therefore, determined that P161 strain is a novel microorganism. The applicant deposited Pseudomonas cichorii H45 to Patent Microorganism Depository Center in the National Institute of Bioscience and Human Technology, Agency of Industrial Science and Technology, Ministry of International Trade and Industry, under the deposition number of FERM P-17410. H45 strain has been internationally deposited on the basis of the Budapest Treaty, and its international accession number is “FERM BP-7374”.

The inventors achieved cloning a gene for a PHA synthase from the novel microorganism H45 strain and sequenced the gene. The inventors also determined an amino acid sequence for the PHA synthase encoded by the gene. Based on the above observation, the present invention was achieved.

Specifically, a PHA synthase of the present invention is a polyhydroxyalkanoate synthase having an amino acid sequence of SEQ ID NO. 1 or 3. Furthermore, the PHA synthase of the present invention may be a PHA synthase substantially retaining the amino acid sequence of SEQ ID NO. 1 and having a modified amino acid sequence where amino acids are deleted, substituted or added as long as it does not deteriorate an activity as the polyhydroxyalkanoate synthase, or a PHA synthase substantially retaining the amino acid sequence of SEQ ID NO. 3 and having a modified amino acid sequence where amino acids are deleted, substituted or added as long as it does not deteriorate activity as the polyhydroxyalkanoate synthase.

A PHA synthase gene of the present invention is a gene for a polyhydroxyalkanoate synthase comprising a DNA encoding the amino acid sequence of SEQ ID NO. 1 or the sequence of its modified amino acid, or a gene for a polyhydroxyalkanoate synthase comprising a DNA encoding the amino acid sequence of SEQ ID NO. 3 or the sequence of its modified amino acid. Embodiments of a PHA synthase gene of the present invention derived from a genome gene in H45 strain include a PHA synthase gene comprising a DNA sequence of SEQ ID NO. 2 as a DNA encoding the amino acid sequence of SEQ ID NO. 1 and a PHA synthase gene comprising a DNA sequence of SEQ ID NO. 4 as a DNA encoding the amino acid sequence of SEQ ID NO. 3.

This invention also provides a recombinant vector comprising a gene DNA encoding the above amino acid sequence as a polyhydroxyalkanoate synthase gene. This invention also provides a transformed microorganism transformed by introducing a recombinant vector adapted to a host.

The present invention also provides a process for preparing a polyhydroxyalkanoate comprising the steps of culturing the transformed microorganism to which a recombinant vector has been introduced in a culture medium containing a substrate for a polyhydroxyalkanoate synthase and collecting the polyhydroxyalkanoate from the culture preparation. The present invention also provides a process for producing a polyhydroxyalkanoate comprising the steps of culturing the transformed microorganism to which a recombinant vector has been introduced and making the transformed microorganism produce the polyhydroxyalkanoate.

A preferable process for producing a polyhydroxyalkanoate may utilize substrate specificity characteristic of a polyhydroxyalkanoate synthase derived from H45 strain: for example, preparation of a polyhydroxyalkanoate comprising a monomer unit represented by formula (I) derived from 3HFPV utilizing the above transformed microorganism or preparation of a polyhydroxyalkanoate comprising a monomer unit represented by formula (VI) derived from 3HCHxB.

A PHA synthase and a gene encoding the PHA synthase of the present invention are derived from a novel microorganism, Pseudomonas cichorii H45 strain and exhibits such substrate specificity that it selectively produces a PHA comprising a monomer unit having a novel side chain structure. A recombinant vector comprising the PHA synthase gene and a microorganism transformed by the recombinant vector are capable of producing a PHA exhibiting substrate specificity similar to Pseudomonas cichorii H45. Thus, a PHA synthase gene of this invention encodes an enzyme which permits preparation of a PHA selectively comprising a monomer unit having a novel side-chain structure and allows us to create a transformed microorganism useful for preparing a PHA having various useful physical properties which may be expected to be applied to a functional polymer.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

A PHA synthase of this invention is an enzyme protein derived from a novel microorganism isolated by the present inventors, Pseudomonas cichorii H45 (FERM P-17410 FERM BP-7374). Specifically, it can covert 5-(4-fluorophenyl)valeric acid (FPVA) into corresponding 3-hydroxy-5-(4-fluorophenyl)valeric acid (3HFPV) and thus has enzymatic activity involved in production of a PHA comprising a corresponding monomer unit.

A PHA synthase and a gene encoding the enzyme of this invention will be more specifically described.

From H45 strain, the inventors have cloned a gene translated into a PHA synthase which exhibits the above substrate specificity, to determine the presence of a PHA synthase comprising at least two amino acid sequences. Specifically, a PHA synthase of this invention in a chromogene in H45 strain comprises two enzymes, i.e., a PHA synthase comprising the amino acid sequence of SEQ ID NO. 1 encoded by a DNA having the sequence of SEQ ID NO. 2 and a PHA synthase comprising the amino acid sequence of SEQ ID NO. 3 encoded by a DNA having the sequence of SEQ ID NO. 4. Gene DNAs of the sequences of SEQ ID NOs. 2 and 4 may be cloned by the following procedure.

Since a PHA synthase is an enzyme protein translated from a chromogene in Pseudomonas cichorii H45 strain, a chromosome DNA containing a desired PHA synthase is first obtained. A chromosome DNA may be separated from H45 strain cells by a known separation method. For example, H45 strain is cultured in a LB medium or an M9 medium supplemented with an appropriate carbon source, disrupt and treated as described by, for example, Marmer et al. in Journal of Molecular Biology, Vol. 3, p. 208 (1961) to prepare a chromosome DNA.

Then, a gene library is prepared from the chromosome DNA thus obtained. The chromosome DNA is degraded using an appropriate restriction enzyme (e.g., Sau3AI) and a fragment with a proper length is ligated with a ligatable vector truncated with a restriction enzyme (e.g., BamHI) to prepare a gene library.

Depending on a vector used in preparing a library, a proper fragment length varies, e.g., about 4000 to 25000 bps for a usual plasmid vector and about 15000 to 30000 bps for a cosmid or phage vector. A proper length of DNA fragment may be collected by a known method such as a method using a sucrose density gradient or using an agarose gel described in Molecular Cloning, Cold Spring Harbor Laboratory (1982).

Since E. coli is used as a host microorganism in a gene library, a vector is a phage vector or plasmid vector which can autonomously grow in the host microorganism (E. coli). Examples of phage or cosmic vectors generally used include pWE15, M13, λEMBL3, λEMBL4, λFIXII, λDASHII, λZAPII, λgt10, λgt11, Charon4A and Charon21A. Examples of frequently used plasmid vectors include pBR, pUC, pBluescriptII, pGEM, pTZ and pET groups. In addition to E. coli, various shuttle vectors may be used, e.g., vectors which may autonomously replicate in a plurality of host microorganisms such as Pseudomonas sp. Again, these vectors may be, depending on a chromosome DNA to be ligated to them, truncated with a proper restriction enzyme to provide a desired fragment.

A chromosome DNA fragment may be ligated with a vector fragment using a DNA ligase. For example, a commercially available ligation kit (Takara Shuzo Co., Ltd., etc.) may be used. Thus, for example, various chromosome DNA fragments may be ligated with a plasmid vector fragment to prepare a mixture of recombinant plasmids comprising various DNA fragments (hereinafter, referred to as a “gene library”).

In addition to a method using a proper length of chromosome DNA fragment, a gene library may be prepared by a method that all mRNAs are extracted from H45 strain, purified and used for preparation of a cDNA fragment using a reverse transcriptase as described in Molecular Cloning, Cold Spring Harbor Laboratory, 1982. Alternatively, a prepared vector is used in a gene library to transform or transduce to E. coli, and then the host E. coli is cultured to amplify the gene library to a large amount as described in Molecular Cloning, Cold Spring Harbor Laboratory, 1982.

A recombinant vector comprising a gene DNA fragment may be introduced into a host microorganism by a known method. For example, when using E. coli as a host microorganism, a recombinant plasmid vector may be introduced using a calcium chloride method (Journal of Molecular Biology, Vol. 53, p. 159 (1970)), a rubidium chloride method (Methods in Enzymology, Vol. 68, p. 253 (1979)), electroporation (Current Protocols in Molecular Biology, Vol. 1, p. 1.8.4 (1994)). When using a cosmid vector or phage vector, transduction in a host E. coli may be conducted using in vitro packaging (Current Protocols in Molecular Biology, Vol. 1, p. 5.7.1 (1994)). Alternatively, conjugational transfer with a strain retaining a recombinant vector may be utilized to prepare a strain retaining a vector.

Then, from the gene library, a probe is prepared for obtaining a DNA fragment comprising a PHA synthase gene of H45 strain.

Some base sequences have been reported for PHA synthase genes in known microorganisms; for example, Peoples, O. P. and Sinskey, A. J., J. Biol. Chem., 264, 15293 (1989); Huisman, G. W. et al., J. Biol. Chem., 266, 2191 (1991); Pieper, U. et al., FEMS Microbiol. Lett., 96, 73 (1992); Timm, A. and Steinbuchel, A., Eur. J. Biochem., 209, 15(1992); Matsusaki, H. et al., J. Bacteriol., 180, 6459 (1998). These reported sequences are compared to select a region where a sequence is preserved to a higher degree and thus to design an oligonucleotide for a primer used in polymerase chain reaction (hereinafter, referred to as “PCR”). Such oligonucleotides for a primer utilizing a common feature of PHA synthase genes include, but not limited to, a sequence described in Timm, A. and Steinbuchel, A., Eur. J. Biochem., 209, 15 (1992). An oligonucleotide may be synthesized using, for example, a commercially available DNA synthesizer such as Custom Synthesis Service, Amersham-Pharmacia Biotech, depending on a designed sequence.

For a PHA synthase gene derived from H45 of this invention, synthetic DNAs having the sequences of SEQ ID NOs. 5 and 6 were designed.

Then, the designed oligonucleotide as a primer is subject to polymerase chain reaction (PCR) using a chromosome DNA in H45 strain as a template to obtain a PCR amplified fragment. The PCR amplified fragment, which is derived from the primer, comprises a sequence common in PHA synthase genes at both ends. A partial sequence derived from the PHA synthase gene itself in H45 strain as a template is contained between sequences complementary to the primer at both ends.

The PCR amplified fragment obtained is, therefore, almost 100% homologous to the PHA synthase gene in H45 strain and is expected to exhibit a higher S/N ratio as a probe in colony hybridization. In addition, it may facilitate stringency control of hybridization.

The above PCR amplified fragment is labeled with an appropriate reagent and used as a probe to colony-hybridize the above chromosome DNA library for selecting a recombinant E. coli strain retaining the PHA synthase gene (Current Protocols in Molecular Biology, Vol. 1, p. 6.0.3 (1994)). For example, the PCR amplified fragment may be labeled using a common detection system using a labeled enzyme or a commercially available kit such as AlkPhosDirect (Amersham-Pharmacia Biotech).

A recombinant E. coli strain retaining a gene fragment comprising a PHA synthase gene may be selected by, in addition to the above method using a gene type, a method using a phenotype where PHA synthesis is directly evaluated. Specifically, in expression of a PHA synthase from a retained PHA synthase gene in a recombinant E. coli strain, PHA is produced by the PHA synthase. PHA synthesis may be detected to select a recombinant E. coli strain in which the PHA synthase is expressed. PHA synthesis may be detected by, for example, staining with Sudan Black B (Archives of Biotechnology, Vol. 71, p. 283 (1970)) or determination of PHA accumulation by phase contrast microscopy.

A plasmid is collected from a recombinant E. coli selected by any of the above methods using an alkali method (Current Protocols in Molecular Biology, Vol. 1, p. 1.6.1 (1994)). The collected plasmid may be used to provide a DNA fragment comprising a PHA synthase gene or multiple DNA fragments partially containing a PHA synthase gene. The DNA fragment obtained may be sequenced by, for example, the Sanger's sequencing method (Molecular Cloning, Vol. 2, p. 13.3 (1989). Specifically, it may be conducted by a dye-primer method or a dye-terminator method using an automatic sequencer such as DNA Sequencer 377A (Parkin Elmer). Since the sequence of the vector itself in which the DNA fragment has been incorporated is known, the sequence of the DNA fragment cloned therein may be unequivocally analyzed.

After sequencing all the obtained DNA fragments comprising a PHA synthase gene, hybridization may be conducted using a DNA fragment prepared by an appropriate method such as chemical synthesis, PCR using a chromosome DNA as a template or degradation of a DNA fragment comprising the sequence with a restriction enzyme as a probe to provide a PHA synthase gene DNA of this invention.

The inventors have selected a gene translated into a PHA synthase exhibiting the above substrate specificity from H45 strain according to the above procedure to find a PHA synthase comprising at least two amino acid sequences. Specifically, the inventors have found a PHA synthase gene collected from the chromosome DNA of H45 strain and comprising the sequence of SEQ ID NO. 2 and a PHA synthase encoded by the gene and comprising the amino acid of SEQ ID NO. 1 as well as a PHA synthase gene comprising the sequence of SEQ ID NO. 4 and a PHA synthase encoded by the gene and comprising the amino acid of SEQ ID NO. 3.

A PHA synthase gene of the present invention may include a degenerated isomer encoding the same polypeptide which has the same amino acid sequence and is different in a degeneration codon. More specifically, it also includes a degenerated isomer by selection and conversion of a more frequently used degenerated codon encoding the same amino acid depending on a host. Besides the PHA synthase comprising the amino acid sequence of SEQ ID NO. 1 inherent in H45 strain and the PHA synthase comprising the amino acid sequence of SEQ ID NO. 3, a PHA synthase of this invention may have mutation such as deletion, substitution and addition for several amino acids as long as its PHA producing activity and substrate specificity may not be deteriorated or the amino acid sequence may be maintained. Mutation such as deletion, substitution and addition may be introduced by a site mutation introduction technique based on a PHA synthase gene inherent in H45 strain having the sequence of SEQ ID NO. 2 or 4 (Current Protocols in Molecular Biology Vol. 1, p. 8.1.1 (1994)).

A recombinant vector of the present invention is used in an application where a recombinant PHA synthase of this invention is expressed using Pseudomonas sp. or a microorganism such as E. coli as a host. It is, therefore, preferable that the recombinant vector of this invention itself can autonomously replicate in a host used while comprising a promoter for expression, a PHA synthase gene DNA of this invention and a transcription termination sequence suitable to the host. In addition, it is preferable that after introducing the recombinant vector, a vector comprising various marker genes used for its selection is used.

Expression vectors suitable to various types of bacterial hosts such as Pseudomonas sp. and E. coli include pLA2917 (ATCC 37355) having a RK2 replication origin which may be replicated and retained by a range of hosts or pJRD215 (ATCC 37533) having a RSF1010 replication origin. Without being limited to these, any vector having a replication origin which may be replicated and retained by a range of hosts may be used. Any promoter which may be expressed in a bacterium as a host may be used; for example, promoters derived from E. coli, a phage, etc. such as trp, trc, tac, lac, PL, PR, T7 and T3 promoters.

When using a yeast as a host, an expression vector may be YEp13, YCp50, pRS or pYEX vector. A promoter may be, for example, GAL or A0D promoter.

A transformed microorganism of this invention may be produced by introducing a recombinant vector of this invention into a host suitable to an expression vector used during preparing the recombinant vector. Examples of bacteria which may be used as a host include Esherichia sp., Pseudomonas sp., Ralstonia sp., Alcaligenes sp., Comamonas sp., Burkholderia sp., Agrobacterium sp., Flabobacterium sp., Vibrio sp., Enterobacter sp., Rhizobium sp., Gluconobacter sp., Acinetobacter sp., Moraxella sp., Nitrosomonas sp., Aeromonas sp., Paracoccus sp., Bacillus sp., Clostridium sp., Lactobacillus sp., Corynebacterium sp., Arthrobacter sp., Achromobacter sp., Micrococcus sp., Mycobacterium sp., Streptococcus sp., Streptomyces sp., Actinomyces sp., Norcadia sp. and Methylobacterium sp. A recombinant DNA may be introduced into a bacterium by an appropriate technique such as the above calcium chloride method and electroporation.

Besides the above bacteria, yeasts and molds such as Saccharomyces sp. and Candida sp. may be used as a host. A recombinant DNA may be introduced into an yeast by, for example, electroporation (Methods Enzymol., 194, 182-187 (1990)), a spheroplast method (Proc. Natl. Acad. Sci. USA, 84, 1929-1933 (1978)) and a lithium acetate method (J. Bacteriol., 153, 163-168 (1983)).

A PHA synthase of this invention may be prepared by culturing a transformant of this invention prepared by the above procedure and making a corresponding PHA synthase gene in an introduced expression vector producing the synthase as a recombinant protein. The PHA synthase of this invention is produced and accumulated in the culture (cultured bacterium or culture supernatant) and separated from the culture to be used for production of a recombinant enzyme protein. For this purpose, a transformant of this invention may be cultured by a usual procedure used for culturing a host. Culturing may be conducted by any of common methods used for culturing a microorganism such as batch, flow batch, continuous culturing and reactor styles. This culturing may be conducted by using, for example, a medium containing an inducer for expressing the above polyhydroxyalkanoate synthase gene.

For a transformant obtained using a bacterium such as E. coli as a host, a medium used for culturing may be a complete medium or synthetic medium such as LB medium and M9 medium. A microorganism may be grown by aerobically culturing at a culturing temperature of 25 to 37° C. for 8 to 72 hours. Then, the bacteria are collected for obtaining a PHA synthase accumulated in them. Examples of a carbon source for the microorganism include sugars such as glucose, fructose, sucrose, maltose, galactose and starches; lower alcohols such as ethanol, propanol and butanol; polyalcohols such as glycerol; organic acids such as acetic acid, citric acid, succinic acid, tartaric acid, lactic acid and gluconic acid; and aliphatic acids such as propionic acid, butanoic acid, pentanoic acid, hexanoic acid, heptanoic acid, octanoic acid, nonanoic acid, decanoic acid, undecanoic acid and dodecanoic acid.

Examples of a nitrogen source include ammonia; ammonium salts such as ammonium chloride, ammonium sulfate and ammonium phosphate; and natural product derivatives such as peptone, meat extract, yeast extract, malt extract, casein decomposition products and corn steep liquor. Examples of an inorganic material include potassium dihydrogen phosphate, potassium monohydrogen phosphate, magnesium phosphate, magnesium sulfate and sodium chloride. The culture medium may contain an antibiotic such as kanamycin, ampicillin, tetracyclin, chloramphenicol and streptomycin, depending on, for example, the type of a drug resistance gene used as a marker gene.

When using an inducible promoter in an expression vector, expression may be enhanced by adding a proper inducer depending on the type of the promoter during culturing a transformed microorganism. For example, the inducer may be isopropyl-β-D-thiogalactopyranoside (IPTG), tetracyclin or indoleacrylic acid (IAA).

A PHA synthase may be separated and purified by centrifuging and collecting a culture obtained and processing it by a technique such as affinity chromatography, cation or anion exchange chromatography and gel filtration alone or in combination as appropriate. Whether a purified material is a desired enzyme is determined by a usual method such as SDS polyacrylamide gel electrophoresis and Western blotting.

This invention is not limited to the procedures as described above for culturing of a transformed microorganism of the present invention, production of a PHA synthase by the transformed microorganism of this invention and accumulating it in bacterial cells, and collection and purification of the PHA synthase from the cells.

A transformed microorganism of the present invention may be used for expressing a recombinant PHA synthase to produce a desired PHA by culturing thereof. For example, the microorganism may be cultured under the above culturing conditions to produce a recombinant PHA synthase while a substrate corresponding to the desired PHA on which the PHA synthase acts is added to a medium. Most conveniently, the PHA may be collected from the culture and the producing bacteria by extraction with an organic solvent commonly used such as chloroform. In an environment where using an organic solvent such as chloroform is undesirable, the culture may be treated a surfactant such as SDS, an enzyme such as lysozyme, or an agent such as EDTA, sodium hypochlorite and ammonia to remove bacterium components other than the PHA for collecting the PHA. This invention is not limited to the above procedures for culturing of a transformed microorganism of this invention for production of a PHA, production of a PHA by and accumulation thereof in a cultured microorganism, and collection of the PHA from a recombinant microorganism.

EXAMPLES

This invention will be more specifically described with reference to Examples, although these Examples are illustrated as the best embodiments of this invention and do not limit the technical range of this invention.

Example 1 Cloning of a PHA Synthase Gene of H45 Strain

H45 strain was cultured in 100 mL of LB medium (1% polypeptone, 0.5% yeast extract, 0.5% sodium chloride, pH 7.4) at 30° C. overnight and then a chromosome DNA was separated and collected as described by Marmer. The obtained chromosome DNA was completely digested using a restriction enzyme BglII. A vector pUC18 was cleaved with a restriction enzyme BamHI. After dephosphorylation of the terminals (Molecular Cloning, Vol. 1, p. 5.7.2 (1989), Cold Spring Harbor Laboratory), the cleaved site of the vector (cloning site) and the chromosome DNA fragment after BglII complete digestion were ligated using a DNA ligation kit Ver. II (Takara Shuzo Co., Ltd.). The plasmid vector in which the chromosome DNA fragment was integrated was used to transform Escheichia coli HB101 for preparing a chromosome DNA library for H45 strain.

Then, in order to select a DNA fragment comprising a PHA synthase gene of H45 strain, a probe for colony hybridization was prepared. An oligonucleotide consisting of the sequences of SEQ ID NOs. 5 and 6 (Amersham-Pharmacia Biotech) was prepared and used as a primer for PCR using the chromosome DNA as a template. A PCR-amplified DNA fragment was used as a probe. Labeling of the probe was conducted using a commercially available labeling enzyme system AlkPhosDirect (Amersham-Pharmacia Biotech). The labeled probe thus obtained was used to select an E. coli strain containing a recombinant plasmid comprising the PHA synthase gene from the chromosome DNA library of H45 strain by colony hybridization. From the selected strain, the plasmid was collected by an alkali method to prepare a DNA fragment comprising a PHA synthase gene.

The gene DNA fragment thus obtained was recombined in a vector pBBR122 (Mo BiTec) comprising a wide host range of replication region which did not belong to IncP, IncQ or IncW in an incompatible group. The recombinant plasmid was transformed in Pseudomonas cichorii H45 ml strain (a strain depleted of PHA synthesizing ability) by electroporation, and then the H45 ml strain regained PHA synthesizing ability and exhibited complementarity. It demonstrates that the selected gene DNA fragment comprises a region of a PHA synthase gene translatable into a PHA synthase in Pseudomonas cichorii H45 ml.

The DNA fragment comprising a PHA synthase gene was sequenced by the Sanger's sequencing method. It was thus found that the determined sequence comprised the sequences of SEQ ID NOs. 2 and 4 each of which encoded a peptide chain. As described below, it was determined that both proteins consisting of a peptide chain had enzyme activity and that the sequences of SEQ ID NOs. 2 and 4 were therefore PHA synthase genes. Specifically, it was found that the sequences of SEQ ID NOs. 2 and 4 encoded the amino acid sequences of SEQ ID NOs. 1 and 3, respectively, and that a protein comprising one of these amino acid sequences alone could produce a PHA.

Example 2 Recombination of a PHA Synthase Gene of H45 Strain to an Expression Vector

A PHA synthase gene having the sequence of SEQ ID NO. 2 was PCRed using a chromosome DNA as a template to reproduce the whole length of a PHA synthase gene. An oligonucleotide having a sequence which was an upstream primer to the sequence of SEQ ID NO. 2 and had a sequence upstream of its initiation codon (SEQ ID NO. 7) and an oligonucleotide having a sequence which was a downstream primer to the sequence of SEQ ID NO. 2 and had a sequence downstream of its termination codon (SEQ ID NO. 8) were designed and prepared (Amersham-Pharmacia Biotech). Using these oligonucleotides as a primer, PCR was conducted to amplify the whole length of the PHA synthase gene (LA-PCR kit; Takara Shuzo Co., Ltd.).

Likewise, a PHA synthase gene having the sequence of SEQ ID NO. 4 was PCRed using a chromosome DNA as a template to reproduce the whole length of a PHA synthase gene. An oligonucleotide having a sequence which was an upstream primer to the sequence of SEQ ID NO. 4 and had a sequence upstream of its initiation codon (SEQ ID NO. 9) and an oligonucleotide having a sequence which was a downstream primer to the sequence of SEQ ID NO. 4 and had a sequence downstream of its termination codon (SEQ ID NO. 10) were designed and prepared (Amersham-Pharmacia Biotech). Using these oligonucleotides as a primer, PCR was conducted to amplify the whole length of the PHA synthase gene (LA-PCR kit; Takara Shuzo Co., Ltd.).

Each of the obtained PCR amplified fragment containing the whole length of the PHA synthase gene was completely digested using a restriction enzyme HindIII. Separately, an expression vector pTrc99A was also truncated with a restriction enzyme HindIII and dephosphorylated (Molecular Cloning, Vol. 1, p. 5.7.2 (1989), Cold Spring Harbor Laboratory). To the truncated site of the expression vector pTrc99A was ligated the DNA fragment comprising the whole length of the PHA synthase gene from which unnecessary sequences had been removed at both ends, using a DNA ligation kit Ver. II (Takara Shuzo Co., Ltd.).

Using the recombinant plasmids obtained, Escherichia coli HB101 (Takara Shuzo Co., Ltd.) was transformed by a calcium chloride method. The recombinants obtained were cultured, and the recombinant plasmids were amplified and collected individually. The recombinant plasmid retaining the gene DNA of SEQ ID NO. 2 was designated pH 45-C1 (derived from SEQ ID NO. 2) while the recombinant plasmid retaining the gene DNA of SEQ ID NO. 4 was designated pH 45-C2 (derived from SEQ ID NO. 4). (Example 3) PHA Production (1) using a PHA synthase gene recombinant E. coli.

Using the recombinant plasmids obtained in Example 2, pH 45-C1 (derived from SEQ ID NO. 2) and pH 45-C2 (derived from SEQ ID NO. 4), an Escherichia coli HB101fB (fadB deficient strain) was transformed by a calcium chloride method to prepare recombinant E. coli strains retaining the recombinant plasmid, pH 45-C1 and pH 45-C2 recombinant strains, respectively.

Each of the pH 45-C1 and pH 45-C2 recombinant strains was inoculated to 200 mL of M9 medium containing 0.5% yeast extract and 0.1% FPVA, and the medium was shaken at 37° C. with a rate of 125 strokes/min. After 24 hours, the cells were collected by centrifugation, washed once with cold methanol and lyophilized.

The lyophilized pellet was suspended in 100 mL of chloroform and the suspension was stirred at 60° C. for 20 hours to extract a PHA. After filtering the extract through a membrane filter with a pore size of 0.45 μm, the filtrate was concentrated by rotary evaporation. Then, the concentrate was re-suspended in cold methanol and the precipitant was collected and dried in vacuo to provide a PHA. The PHA thus obtained was subject to methanolysis as usual and analyzed using a gas chromatography-mass spectrometry apparatus (GC-MS, Shimadzu QP-5050, EI technique) to identify methyl-esterified PHA monomer units. Table 1 shows together a cell dry weight, a polymer dry weight for a collected PHA, a polymer yield per a cell (polymer dry weight/cell dry weight) and identities of monomer units for each strain.

TABLE 1 pH45-C1 recombinant pH45-C2 recombinant strain strain Cell dry weight 730 mg/L 770 mg/L Polymer dry weight  36 mg/L  39 mg/L Polymer dry weight/ 5% 5% Cell dry weight Monomer unit composition (area ratio) 3-Hydroxybutyric acid 0% 0% 3-Hydroxyvaleric acid 0% 0% 3-Hydroxyhexanoic acid 0% 0% 3-Hydroxyheptanoic acid 1% 1% 3-Hydroxyoctanoic acid 2% 3% 3-Hydroxynonanoic acid 0% 1% 3-Hydroxydecanoic acid 4% 5% 3-Hydroxy-5-(4- 93%  90%  fluorophenyl) valeric acid

These results show that both pH 45-C1 and pH 45-C2 recombinant strains produce, from the substrate 5-(4-fluorophenyl) valeric acid, PHAs comprising a monomer unit represented by formula (I) derived from corresponding 3-hydroxy-5-(4-fluorophenyl) valeric acid as a main component. It is, therefore, demonstrated that although the pH 45-C1 and pH 45-C2 recombinant strains exclusively produce PHA synthases having the amino acid sequences of SEQ ID NOs. 1 and 3 translated from the PHA synthase genes comprising the sequences of SEQ ID NOs. 2 and 4, respectively, both strains similarly convert the substrate 5-(4-fluorophenyl) valeric acid into the monomer unit represented by formula (I) derived from corresponding 3-hydroxy-5-(4-fluorophenyl) valeric acid and produce a PHA containing the monomer unit.

Example 3 Homology of a PHAsynthase Gene of H45 Strain

In the same manner as in Example 1, the chromosome DNA of H45 strain was separated and collected. Further, Pseudomonas olevorans ATCC29347, Pseudomonas putida Tk2440 and Pseudomonas aeruginose PA01 were cultured and the chromosome DNAs thereof were separated and collected in the same as in Example 1.

Next, a probe for hybridization was prepared for confirming homology of a PHAsynthase gene of H45 strain. In the same manner as in Example 2, an oligonucleotide having the sequences of SEQ ID NOs 7 and 8 were synthesized. (Amersham-Pharmacia Biotech) PCR was conducted using the thus synthesized oligonucleotide as a primer and the chromosome DNA as a template. The obtained PCR amplified DNA fragments were used as a probe. Labeling of the probe using AlkphosDirect (Amersham-Pharmacia Biotech) was conducted to obtain the labeled probe referred to as “phaC1”. In the same manner as above, an oligonucleotide having the sequences of SEQ ID NOs 9 and 10 were synthesized. (Amersham-Pharmacia Biotech) PCR was conducted using the thus synthesized oligonucleotide as a primer and the chromosome DNA as a template. Labeling of the obtained PCR amplified DNA fragments was conducted in the same manner as above to obtain the labeled probe referred to as “phaC2”.

Using the thus obtained probes, homology of the PHA synthase gene was confirmed by a dot-blot method. The thus prepared chromosome DNA was alkalized and then blotted on a nylon film (Tropilon-45, produced by Tropix Co.) by 1 μg at respective points using a dot-blot apparatus (BRL).

The film was dried at 80° C. for two hours, then put in a vinyl bag. 3 ml of the solution for hybridization prepared according to the recipe of AlkPhosDirect was added thereto, and hybridization was conducted at 55° C. for one hour. 15 ng of the labeled probe phaC1 or phaC2 per 3 ml of the above hybridization solution (5 ng/ml) was added to the nylon film, and hybridization was conducted at 55° C. for 12 hours. And then the nylon film was put out from the vinyl bag, and washed two times for 10 minutes at 55° C. with a first washing buffer according the recipe of AlkPhosDirect. And then after it was washed two times for 5 minutes at room temperature with a second washing buffer according to the recipe of AlkPhosDirect, a detecting step was carried out using CDP-Star attached to AlkPhosDirect according to the recipe.

Further, a detecting step was carried out under the same conditions as above except that hybridization and first washing were conducted at 60° C. or 65° C. The results were shown in Table 2.

TABLE 2 Temperature (° C.) 55 60 65 Probe phaC1 Target DNA H45 Strain A A B ATCC29347 Strain C D D KT2440 Strain C D D PAO1 Strain D D D Probe phaC2 Target DNA H45 Strain A A B ATCC29347 Strain C D D KT2440 Strain C D D PAO1 Strain D D D A: Strong Signal, B: Signal, C: Slight Signal, D: No Signal

10 1 559 PRT Pseudomonas cichorii H45 ; FERM BP-7374 1 Met Ser Asn Lys Asn Asn Asp Asp Leu Lys Asn Gln Ala Ser Glu Asn 1 5 10 15 Thr Leu Gly Leu Asn Pro Val Val Gly Leu Arg Gly Lys Asp Leu Leu 20 25 30 Ala Ser Ala Arg Met Val Leu Arg Gln Ala Ile Lys Gln Pro Ile His 35 40 45 Ser Ala Arg His Val Ala His Phe Gly Leu Glu Leu Lys Asn Val Leu 50 55 60 Leu Gly Lys Ser Glu Leu Leu Pro Thr Ser Asp Asp Arg Arg Phe Ala 65 70 75 80 Asp Pro Ala Trp Ser Gln Asn Pro Leu Tyr Lys Arg Tyr Leu Gln Thr 85 90 95 Tyr Leu Ala Trp Arg Lys Glu Leu His Asp Trp Ile Gly Asp Ser Asn 100 105 110 Leu Pro Pro Lys Asp Val Ser Arg Gly His Phe Val Ile Asn Leu Met 115 120 125 Thr Glu Ala Phe Ala Pro Thr Asn Thr Ala Ala Asn Pro Ala Ala Val 130 135 140 Lys Arg Phe Phe Glu Thr Gly Gly Lys Ser Leu Leu Asp Gly Leu Ser 145 150 155 160 His Leu Ala Lys Asp Leu Val His Asn Gly Gly Met Pro Ser Gln Val 165 170 175 Asn Met Gly Ala Phe Glu Val Gly Lys Thr Leu Gly Val Thr Glu Gly 180 185 190 Ala Val Val Phe Arg Asn Asp Val Leu Glu Leu Ile Gln Tyr Lys Pro 195 200 205 Ile Thr Glu Gln Val His Glu Arg Pro Leu Leu Val Val Pro Pro Gln 210 215 220 Ile Asn Lys Phe Tyr Val Phe Asp Leu Ser Pro Glu Lys Ser Leu Ala 225 230 235 240 Arg Phe Cys Leu Arg Asn Asn Val Gln Thr Phe Ile Val Ser Trp Arg 245 250 255 Asn Pro Thr Lys Glu Gln Arg Glu Trp Gly Leu Ser Thr Tyr Ile Glu 260 265 270 Ala Leu Lys Glu Ala Val Asp Val Val Thr Ala Ile Thr Gly Ser Lys 275 280 285 Asp Val Asn Met Leu Gly Ala Cys Ser Gly Gly Ile Thr Cys Thr Ala 290 295 300 Leu Leu Gly His Tyr Ala Ala Ile Gly Glu Asn Lys Val Asn Ala Leu 305 310 315 320 Thr Leu Leu Val Ser Val Leu Asp Thr Thr Leu Asp Ser Asp Val Ala 325 330 335 Leu Phe Val Asp Glu Gln Thr Leu Glu Ala Ala Lys Arg Gln Ser Tyr 340 345 350 Gln Ala Gly Val Leu Glu Gly Arg Asp Met Ala Lys Val Phe Ala Trp 355 360 365 Met Arg Pro Asn Asp Leu Ile Trp Asn Tyr Trp Val Asn Asn Tyr Leu 370 375 380 Leu Gly Asn Glu Pro Pro Val Phe Asp Ile Leu Phe Trp Asn Asn Asp 385 390 395 400 Thr Thr Arg Leu Pro Ala Ala Phe His Gly Asp Leu Ile Glu Met Phe 405 410 415 Lys Ser Asn Pro Leu Thr Arg Ala Asp Ala Leu Glu Val Cys Gly Thr 420 425 430 Pro Ile Asp Leu Lys Lys Val Thr Ala Asp Ile Phe Ser Leu Ala Gly 435 440 445 Thr Ser Asp His Ile Thr Pro Trp Arg Ser Cys Tyr Lys Ser Ala Gln 450 455 460 Leu Phe Gly Gly Asn Val Glu Phe Val Leu Ser Ser Ser Gly His Ile 465 470 475 480 Gln Ser Ile Leu Asn Pro Pro Gly Asn Pro Lys Ser Arg Tyr Met Thr 485 490 495 Ser Thr Gln Met Pro Ala Asp Ala Asp Asp Trp Gln Glu Glu Ser Thr 500 505 510 Lys His Ala Asp Ser Trp Trp Leu His Trp Gln Ala Trp Gln Ala Gln 515 520 525 Arg Ser Gly Asn Leu Lys Lys Ala Pro Ala Lys Leu Gly Asn Lys Ala 530 535 540 Tyr Pro Ala Gly Glu Ala Ala Pro Gly Thr Tyr Val His Glu Arg 545 550 555 2 1680 DNA Pseudomonas cichorii H45 ; FERM BP-7374 2 atgagtaaca agaataacga tgacttgaag aatcaagcct cggaaaacac 50 cttggggctg aatcctgtcg ttggactgcg tggaaaggat ctactggctt 100 ctgctcgcat ggtactcagg caggccatca aacaaccgat tcacagcgcc 150 aggcatgttg cgcatttcgg ccttgaactc aagaacgtgc tgctcggcaa 200 atccgagctg ctaccgacca gcgatgaccg tcgcttcgcg gatccggcct 250 ggagccagaa cccgctctac aaacgttatc tgcaaaccta cctggcgtgg 300 cgcaaggaac tccacgactg gatcggcgac agcaacctgc cgcccaagga 350 cgtcagccgc gggcatttcg tgatcaacct catgaccgaa gccttcgccc 400 cgaccaacac ggcggccaac ccggcggcgg tcaagcgctt cttcgaaacc 450 ggtggcaaaa gcctgctcga tggcctctcg catctggcca aggacctggt 500 gcataacggc ggcatgccga gccaggtcaa catgggcgca ttcgaggtcg 550 gcaagaccct tggtgtgacc gagggcgcag tggtctttcg caacgacgtg 600 ctggagctga tccagtacaa gccgatcacc gagcaggtgc atgaacgccc 650 actgctggtg gtaccgccgc agatcaacaa gttctacgtt ttcgacctga 700 gcccggaaaa aagcctggcg cggttctgcc tgcgcaacaa cgtgcagacc 750 ttcatcgtca gctggcgcaa cccgaccaag gagcagcgcg agtggggcct 800 gtcgacctac atcgaagcgc tcaaggaagc ggttgatgtg gtcaccgcca 850 ttaccggcag caaagacgtg aacatgctcg gtgcctgctc cggcggcatc 900 acctgcaccg cgctgctggg ccactacgca gcaatcggcg agaacaaggt 950 caacgccctg accctgctgg tcagcgtgct cgacaccacc ctggacagcg 1000 acgtggccct gttcgtcgac gagcagaccc tcgaagccgc caagcgccaa 1050 tcgtaccagg ccggcgtgct ggaaggccgc gacatggcca aggtcttcgc 1100 ctggatgcgc cccaacgacc tgatctggaa ctactgggtc aacaactacc 1150 tgttgggcaa cgaaccgccg gttttcgaca ttctgttctg gaacaacgac 1200 accacccggt tgcctgcggc gttccatggc gacctgatcg aaatgttcaa 1250 aagcaatcca ttgacccgcg ccgatgcact ggaagtgtgc ggcacgccga 1300 tcgacctgaa gaaggttacc gccgacatct tctcgctggc cggcaccagc 1350 gaccacatca cgccgtggcg ctcctgctac aagtcggcgc aactgttcgg 1400 cggcaacgtt gaattcgtgc tgtccagcag cgggcacatc cagagcattc 1450 tgaacccgcc gggcaatccg aaatcgcgct acatgaccag cacccaaatg 1500 cccgccgatg ccgatgactg gcaggaagag tcgaccaagc acgccgactc 1550 ctggtggctg cactggcagg catggcaggc acagcgttcg ggcaacctga 1600 aaaaagcacc ggcaaaactg ggcaacaagg cctacccggc aggggaagcc 1650 gcaccgggca cttacgtgca tgagcggtaa 1680 3 560 PRT Pseudomonas cichorii H45 ; FERM BP-7374 3 Met Arg Glu Lys Pro Ala Arg Asp Ser Leu Pro Thr Pro Ala Ala Phe 1 5 10 15 Ile Asn Ala Gln Ser Ala Ile Thr Gly Leu Arg Gly Arg Asp Leu Leu 20 25 30 Ser Thr Leu Arg Ser Val Ala Ala His Gly Leu Arg Asn Pro Val His 35 40 45 Ser Ala Arg His Ala Leu Lys Leu Gly Gly Gln Leu Gly Arg Val Leu 50 55 60 Leu Gly Glu Thr Leu His Pro Thr Asn Pro Gln Asp Thr Arg Phe Ala 65 70 75 80 Asp Pro Ala Trp Ser Leu Asn Pro Phe Tyr Arg Arg Ser Leu Gln Ala 85 90 95 Tyr Leu Ser Trp Gln Lys Gln Val Lys Ser Trp Ile Asp Glu Ser Asp 100 105 110 Met Ser Pro Asp Asp Arg Ala Arg Ala His Phe Ala Phe Ala Leu Leu 115 120 125 Asn Asp Ala Val Ser Pro Ser Asn Thr Leu Leu Asn Pro Leu Ala Val 130 135 140 Lys Glu Leu Phe Asn Ser Gly Gly Asn Ser Leu Val Arg Gly Ile Gly 145 150 155 160 His Leu Val Asp Asp Leu Leu His Asn Asp Gly Leu Pro Arg Gln Val 165 170 175 Thr Lys Gln Ala Phe Glu Val Gly Lys Thr Val Ala Thr Thr Thr Gly 180 185 190 Ala Val Val Phe Arg Asn Glu Leu Leu Glu Leu Ile Gln Tyr Lys Pro 195 200 205 Met Ser Glu Lys Gln Tyr Ser Lys Pro Leu Leu Val Val Pro Pro Gln 210 215 220 Ile Asn Lys Tyr Tyr Ile Phe Asp Leu Ser Pro His Asn Ser Phe Val 225 230 235 240 Gln Tyr Ala Leu Lys Asn Gly Leu Gln Thr Phe Met Ile Ser Trp Arg 245 250 255 Asn Pro Asp Val Arg His Arg Glu Trp Gly Leu Ser Thr Tyr Val Glu 260 265 270 Ala Val Glu Glu Ala Met Asn Val Cys Arg Ala Ile Thr Gly Ala Arg 275 280 285 Glu Val Asn Leu Met Gly Ala Cys Ala Gly Gly Leu Thr Ile Ala Ala 290 295 300 Leu Gln Gly His Leu Gln Ala Lys Arg Gln Leu Arg Arg Val Ser Ser 305 310 315 320 Ala Thr Tyr Leu Val Ser Leu Leu Asp Ser Gln Leu Asp Ser Pro Ala 325 330 335 Ser Leu Phe Ala Asp Glu Gln Thr Leu Glu Ala Ala Lys Arg Arg Ser 340 345 350 Tyr Gln Lys Gly Val Leu Asp Gly Arg Asp Met Ala Lys Val Phe Ala 355 360 365 Trp Met Arg Pro Asn Asp Leu Ile Trp Ser Tyr Phe Val Asn Asn Tyr 370 375 380 Leu Leu Gly Lys Glu Pro Pro Ala Phe Asp Ile Leu Tyr Trp Asn Asn 385 390 395 400 Asp Ser Thr Arg Leu Pro Ala Ala Leu His Gly Asp Leu Leu Asp Phe 405 410 415 Phe Lys His Asn Pro Leu Thr His Pro Gly Gly Leu Glu Val Cys Gly 420 425 430 Thr Pro Ile Asp Leu Gln Lys Val Thr Val Asp Ser Phe Ser Val Ala 435 440 445 Gly Ile Asn Asp His Ile Thr Pro Trp Asp Ala Val Tyr Arg Ser Thr 450 455 460 Leu Leu Leu Gly Gly Glu Arg Arg Phe Val Leu Ser Asn Ser Gly His 465 470 475 480 Val Gln Ser Ile Leu Asn Pro Pro Ser Asn Pro Lys Ala Asn Tyr Val 485 490 495 Glu Asn Gly Lys Leu Ser Ser Asp Pro Arg Ala Trp Tyr Tyr Asp Gly 500 505 510 Arg His Val Asp Gly Ser Trp Trp Thr Gln Trp Leu Ser Trp Val Gln 515 520 525 Glu Arg Ser Gly Ala Gln Lys Glu Thr His Met Ala Leu Gly Asn Gln 530 535 540 Asn Tyr Pro Pro Met Glu Ala Ala Pro Gly Thr Tyr Val Arg Val Arg 545 550 555 560 4 1683 DNA Pseudomonas cichorii H45 ; FERM BP-7374 4 atgcgcgaga aaccagcgag ggattcgtta ccgactcccg ccgcgttcat 50 caatgcacag agtgcgatta ccggcctgcg cggtcgggat ctgttatcga 100 ccctgcgcag tgtggccgcc catggcttgc gcaatccggt gcacagtgcc 150 cgacatgccc tcaaactcgg cggccagctt ggtcgtgtgc tgctgggtga 200 aaccctgcac ccgaccaacc cgcaggacac tcgcttcgcc gatccggcgt 250 ggagcctcaa cccgttttac cggcgcagcc tgcaggccta tctgagctgg 300 cagaagcagg tcaaaagctg gatcgacgag agcgacatga gcccggacga 350 ccgcgcccgc gcccacttcg ctttcgcctt gctcaacgac gccgtatcgc 400 cctccaacac cctgctcaat ccattggcgg tcaaggagct cttcaattcc 450 ggtggtaaca gcctggtgcg tggcatcggc catctggtgg acgatctgct 500 gcacaacgat ggcttgcccc ggcaagtcac caagcaagcg ttcgaggtcg 550 gcaagacggt cgccaccacc accggtgccg tggtgtttcg caacgaactg 600 ctggagttga tccagtacaa gccgatgagc gaaaagcagt attccaagcc 650 cctgctggtg gtgccgccac aaatcaacaa gtactacatt ttcgacctga 700 gcccccacaa cagcttcgtc cagtacgcgc tgaaaaacgg cctgcagacc 750 ttcatgatca gctggcgcaa cccggatgtg cgtcaccgtg aatgggggct 800 ctcgacctac gtggaagccg tggaagaggc catgaatgtg tgccgggcga 850 tcaccggcgc acgcgaggtc aacctgatgg gcgcctgcgc cggcgggttg 900 accattgccg cgttgcaagg ccacttgcag gccaagcggc aactgcgcag 950 ggtgtccagt gcgacttatc tggtgagcct gctcgacagc cagctggata 1000 gccccgcttc gctgttcgcc gacgagcaga ctctggaggc cgccaagcgc 1050 cgctcctatc agaaaggtgt gctggacggc cgcgacatgg ccaaggtctt 1100 cgcctggatg cgccccaacg atttgatctg gagctacttc gtcaacaact 1150 acctgttggg caaggagccg ccggcgttcg acatcctcta ctggaacaac 1200 gacagcacgc gcctgccggc cgccctgcat ggcgacctgc tggacttctt 1250 caagcacaac ccgctgaccc acccgggcgg cctggaagtg tgtggcacgc 1300 cgatcgattt gcagaaggtc accgtcgaca gcttcagcgt cgccggcatc 1350 aacgatcaca tcacgccgtg ggatgcggtg tatcgctcga cgctgttgct 1400 cggtggcgag cggcgctttg tgctatccaa cagcggtcat gtgcagagca 1450 tcctcaaccc gccgagcaac ccgaaagcca actacgtcga aaacggcaaa 1500 ctgagcagcg acccccgcgc ctggtactac gacggcaggc atgtcgacgg 1550 cagttggtgg acccaatggc tgagctgggt tcaggaacgc tccggcgcac 1600 agaaggaaac ccacatggcg ctcggcaacc agaactatcc accgatggaa 1650 gctgcgcccg gtacctacgt acgtgtgcgc tga 1683 5 20 DNA Artificial Sequence Primer for PCR multiplication 5 tgctggaact gatccagtac 20 6 23 DNA Artificial Sequence Primer for PCR multiplication 6 gggttgagga tgctctggat gtg 23 7 30 DNA Artificial Sequence Primer for PCR multiplication 7 ctacaaagct tgacccggta ctcgtctcag 30 8 28 DNA Artificial Sequence Primer for PCR multiplication 8 cgagcaagct tgctcctaca gtagggcg 28 9 29 DNA Artificial Sequence Primer for PCR multiplication 9 gttttaagct tgaagacgaa ggagtgttg 29 10 29 DNA Artificial Sequence Primer for PCR multiplication 10 atcgcaagct tactcgctcc taccgggtc 29 

What is claimed is:
 1. An isolated polyhydroxyalkanoate synthase having the amino acid sequence of SEQ ID NO:
 1. 2. An isolated polyhydroxyalkanoate synthase having an amino acid sequence, which is at least 95% homologous with the amino acid sequence of SEQ ID NO:
 1. 3. A method of preparing a polyhydroxyalkanoate synthase of claim 1 or 2, comprising the steps of culturing a transformed microorganism harboring a recombinant vector containing a DNA sequence encoding said polyhydroxyalkanoate synthase in a medium; expressing said DNA; and isolating the polyhydroxyalkanoate synthase from the culture obtained.
 4. A method for producing the polyhydroxyalkanoate synthase according to claim 3, wherein the DNA has the sequence according to SEQ ID NO:
 2. 